The following are the specifications for all the YES WorldWatch V7 watches:
Across the planet there are upwards of 20 different Daylight Saving Time systems. The WorldWatch incorporates all of them in the programming for the relevant cities and automatically adjusts for them. If need be, DST can also be turned ON and OFF manually.
The YES WorldWatch V7 keep times for sunrise, sunset, zenith and twilight for where you are. The calculations are based on astronomical algorithms using LAT/LON, time zone and relevant DST system. It is pre-programmed to 650 cities worldwide.